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DHCP on WAN Interface - Cisco 881
I have a Cisco 881 IOS Version 12.4(15r)XZ2. I need to configure the WAN (FastEthernet 4) port to get a DHCP address from any available DHCP server on any network which it might be attached to. all I have done to the router from factory default is:
en
conf t
hostname cart1-rtr1
int fa 4
no shut
ip add dhcp
The WAN interface will not get a DHCP address from certian LANs which use an IP helper. IE it will get a DHCP address on one of our LANS which is directly attached to the DHCP server, but not the other LAN which uses an IP helper to get to the DHCP server. What am I missing?
--------------- Here is the current config--------------------
Current configuration : 826 bytes
!
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname cart1-rtr1
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
enable secret 5 xxxxxxxxxxxxxxxxxxxxxxxxxx
!
no aaa new-model
!
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
ip cef
!
!
!
!
!
!
archive
log config
hidekeys
!
!
!
!
!
interface FastEthernet0
!
interface FastEthernet1
!
interface FastEthernet2
!
interface FastEthernet3
!
interface FastEthernet4
ip address dhcp
duplex auto
speed auto
!
interface Vlan1
no ip address
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
!
!
!
!
!
control-plane
!
!
line con 0
no modem enable
line aux 0
line vty 0 4
login
!
scheduler max-task-time 5000
end
--------------------------
*Sep 23 19:46:00.147: DHCP: SDiscover attempt # 3 for entry:
*Sep 23 19:46:00.147: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet
4
*Sep 23 19:46:00.147: Temp sub net mask: 0.0.0.0
*Sep 23 19:46:00.147: DHCP Lease server: 0.0.0.0, state: 3 Selecting
*Sep 23 19:46:00.147: DHCP transaction id: A92
*Sep 23 19:46:00.147: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Sep 23 19:46:00.147: Next timer fires after: 00:00:04
*Sep 23 19:46:00.147: Retry count: 3 Client-ID: cisco-0022.559e.08ba-Fa4
*Sep 23 19:46:00.147: Client-ID hex dump: 636973636F2D303032322E3535
*Sep 23 19:46:00.147: 303862612D466134
*Sep 23 19:46:00.147: Hostname: cart1-rtr1
*Sep 23 19:46:00.147: DHCP: SDiscover: sending 297 byte length DHCP packet
*Sep 23 19:46:00.147: DHCP: SDiscover 297 bytes
*Sep 23 19:46:00.147: B'cast on FastEthernet4 interface from 0.0.0.0
*Sep 23 19:46:04.147: DHCP: QScan: Timed out Selecting state%Unknown DHCP proble
m.. No allocation possible
*Sep 23 19:46:13.527: DHCP: Waiting for 60 seconds on interface FastEthernet4
*Sep 23 19:46:44.147: DHCP: QScan: Purging entry
*Sep 23 19:46:44.147: DHCP: deleting entry 847614C8 0.0.0.0 from list
*Sep 23 19:46:44.147: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet
4
*Sep 23 19:46:44.147: Temp sub net mask: 0.0.0.0
*Sep 23 19:46:44.147: DHCP Lease server: 0.0.0.0, state: 11 Purging
*Sep 23 19:46:44.147: DHCP transaction id: A92
*Sep 23 19:46:44.147: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Sep 23 19:46:44.147: No timer running
*Sep 23 19:46:44.147: Retry count: 0 Client-ID: cisco-0022.559e.08ba-Fa4
*Sep 23 19:46:44.147: Client-ID hex dump: 636973636F2D303032322E3535
*Sep 23 19:46:44.147: 303862612D466134
*Sep 23 19:46:44.147: Hostname: cart1-rtr1
*Sep 23 19:47:13.527: DHCP: Try 19 to acquire address for FastEthernet4
*Sep 23 19:47:13.527: DHCP: allocate request
*Sep 23 19:47:13.527: DHCP: new entry. add to queue, interface FastEthernet4
*Sep 23 19:47:13.527: DHCP: SDiscover attempt # 1 for entry:
*Sep 23 19:47:13.527: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet
4
*Sep 23 19:47:13.527: Temp sub net mask: 0.0.0.0
*Sep 23 19:47:13.527: DHCP Lease server: 0.0.0.0, state: 3 Selecting
*Sep 23 19:47:13.527: DHCP transaction id: A93
*Sep 23 19:47:13.527: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Sep 23 19:47:13.527: Next timer fires after: 00:00:04
*Sep 23 19:47:13.527: Retry count: 1 Client-ID: cisco-0022.559e.08ba-Fa4
*Sep 23 19:47:13.527: Client-ID hex dump: 636973636F2D303032322E3535
*Sep 23 19:47:13.527: 303862612D466134
*Sep 23 19:47:13.527: Hostname: cart1-rtr1
*Sep 23 19:47:13.527: DHCP: SDiscover: sending 297 byte length DHCP packet
*Sep 23 19:47:13.527: DHCP: SDiscover 297 bytes
*Sep 23 19:47:13.527: B'cast on FastEthernet4 interface from 0.0.0.0
*Sep 23 19:47:21.147: DHCP: SDiscover attempt # 3 for entry:
*Sep 23 19:47:21.147: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet
4
*Sep 23 19:47:21.147: Temp sub net mask: 0.0.0.0
*Sep 23 19:47:21.147: DHCP Lease server: 0.0.0.0, state: 3 Selecting
*Sep 23 19:47:21.147: DHCP transaction id: A93
*Sep 23 19:47:21.147: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Sep 23 19:47:21.147: Next timer fires after: 00:00:04
*Sep 23 19:47:21.147: Retry count: 3 Client-ID: cisco-0022.559e.08ba-Fa4
*Sep 23 19:47:21.147: Client-ID hex dump: 636973636F2D303032322E3535
*Sep 23 19:47:21.147: 303862612D466134
*Sep 23 19:47:21.147: Hostname: cart1-rtr1
*Sep 23 19:47:21.147: DHCP: SDiscover: sending 297 byte length DHCP packet
*Sep 23 19:47:21.147: DHCP: SDiscover 297 bytes
*Sep 23 19:47:21.147: B'cast on FastEthernet4 interface from 0.0.0.0
*Sep 23 19:47:25.147: DHCP: QScan: Timed out Selecting state%Unknown DHCP proble
m.. No allocation possible
*Sep 23 19:47:34.007: DHCP: Waiting for 60 seconds on interface FastEthernet4
en
conf t
hostname cart1-rtr1
int fa 4
no shut
ip add dhcp
The WAN interface will not get a DHCP address from certian LANs which use an IP helper. IE it will get a DHCP address on one of our LANS which is directly attached to the DHCP server, but not the other LAN which uses an IP helper to get to the DHCP server. What am I missing?
--------------- Here is the current config--------------------
Current configuration : 826 bytes
!
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname cart1-rtr1
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
enable secret 5 xxxxxxxxxxxxxxxxxxxxxxxxxx
!
no aaa new-model
!
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
ip cef
!
!
!
!
!
!
archive
log config
hidekeys
!
!
!
!
!
interface FastEthernet0
!
interface FastEthernet1
!
interface FastEthernet2
!
interface FastEthernet3
!
interface FastEthernet4
ip address dhcp
duplex auto
speed auto
!
interface Vlan1
no ip address
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
!
!
!
!
!
control-plane
!
!
line con 0
no modem enable
line aux 0
line vty 0 4
login
!
scheduler max-task-time 5000
end
--------------------------
*Sep 23 19:46:00.147: DHCP: SDiscover attempt # 3 for entry:
*Sep 23 19:46:00.147: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet
4
*Sep 23 19:46:00.147: Temp sub net mask: 0.0.0.0
*Sep 23 19:46:00.147: DHCP Lease server: 0.0.0.0, state: 3 Selecting
*Sep 23 19:46:00.147: DHCP transaction id: A92
*Sep 23 19:46:00.147: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Sep 23 19:46:00.147: Next timer fires after: 00:00:04
*Sep 23 19:46:00.147: Retry count: 3 Client-ID: cisco-0022.559e.08ba-Fa4
*Sep 23 19:46:00.147: Client-ID hex dump: 636973636F2D303032322E3535
*Sep 23 19:46:00.147: 303862612D466134
*Sep 23 19:46:00.147: Hostname: cart1-rtr1
*Sep 23 19:46:00.147: DHCP: SDiscover: sending 297 byte length DHCP packet
*Sep 23 19:46:00.147: DHCP: SDiscover 297 bytes
*Sep 23 19:46:00.147: B'cast on FastEthernet4 interface from 0.0.0.0
*Sep 23 19:46:04.147: DHCP: QScan: Timed out Selecting state%Unknown DHCP proble
m.. No allocation possible
*Sep 23 19:46:13.527: DHCP: Waiting for 60 seconds on interface FastEthernet4
*Sep 23 19:46:44.147: DHCP: QScan: Purging entry
*Sep 23 19:46:44.147: DHCP: deleting entry 847614C8 0.0.0.0 from list
*Sep 23 19:46:44.147: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet
4
*Sep 23 19:46:44.147: Temp sub net mask: 0.0.0.0
*Sep 23 19:46:44.147: DHCP Lease server: 0.0.0.0, state: 11 Purging
*Sep 23 19:46:44.147: DHCP transaction id: A92
*Sep 23 19:46:44.147: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Sep 23 19:46:44.147: No timer running
*Sep 23 19:46:44.147: Retry count: 0 Client-ID: cisco-0022.559e.08ba-Fa4
*Sep 23 19:46:44.147: Client-ID hex dump: 636973636F2D303032322E3535
*Sep 23 19:46:44.147: 303862612D466134
*Sep 23 19:46:44.147: Hostname: cart1-rtr1
*Sep 23 19:47:13.527: DHCP: Try 19 to acquire address for FastEthernet4
*Sep 23 19:47:13.527: DHCP: allocate request
*Sep 23 19:47:13.527: DHCP: new entry. add to queue, interface FastEthernet4
*Sep 23 19:47:13.527: DHCP: SDiscover attempt # 1 for entry:
*Sep 23 19:47:13.527: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet
4
*Sep 23 19:47:13.527: Temp sub net mask: 0.0.0.0
*Sep 23 19:47:13.527: DHCP Lease server: 0.0.0.0, state: 3 Selecting
*Sep 23 19:47:13.527: DHCP transaction id: A93
*Sep 23 19:47:13.527: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Sep 23 19:47:13.527: Next timer fires after: 00:00:04
*Sep 23 19:47:13.527: Retry count: 1 Client-ID: cisco-0022.559e.08ba-Fa4
*Sep 23 19:47:13.527: Client-ID hex dump: 636973636F2D303032322E3535
*Sep 23 19:47:13.527: 303862612D466134
*Sep 23 19:47:13.527: Hostname: cart1-rtr1
*Sep 23 19:47:13.527: DHCP: SDiscover: sending 297 byte length DHCP packet
*Sep 23 19:47:13.527: DHCP: SDiscover 297 bytes
*Sep 23 19:47:13.527: B'cast on FastEthernet4 interface from 0.0.0.0
*Sep 23 19:47:21.147: DHCP: SDiscover attempt # 3 for entry:
*Sep 23 19:47:21.147: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet
4
*Sep 23 19:47:21.147: Temp sub net mask: 0.0.0.0
*Sep 23 19:47:21.147: DHCP Lease server: 0.0.0.0, state: 3 Selecting
*Sep 23 19:47:21.147: DHCP transaction id: A93
*Sep 23 19:47:21.147: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Sep 23 19:47:21.147: Next timer fires after: 00:00:04
*Sep 23 19:47:21.147: Retry count: 3 Client-ID: cisco-0022.559e.08ba-Fa4
*Sep 23 19:47:21.147: Client-ID hex dump: 636973636F2D303032322E3535
*Sep 23 19:47:21.147: 303862612D466134
*Sep 23 19:47:21.147: Hostname: cart1-rtr1
*Sep 23 19:47:21.147: DHCP: SDiscover: sending 297 byte length DHCP packet
*Sep 23 19:47:21.147: DHCP: SDiscover 297 bytes
*Sep 23 19:47:21.147: B'cast on FastEthernet4 interface from 0.0.0.0
*Sep 23 19:47:25.147: DHCP: QScan: Timed out Selecting state%Unknown DHCP proble
m.. No allocation possible
*Sep 23 19:47:34.007: DHCP: Waiting for 60 seconds on interface FastEthernet4
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FYI.... YES the DHCP server and IP helper work on that LAN and have been tested with other DHCP clients.
hello............ Is this thing on?
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A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.